When Hitler expounded his intention to invade Russia his generals looked at him in horrified silence. The Soviet Union was vast and had matchless resources. Hitler’s whole plan depended upon striking a swift and decisive knock-out blow. A long, drawn-out war would ensure a loss for Germany. Hitler was certain his forces could do it since no country had yet defeated them, but here had never been a military gamble like this. This episode covers Stalingrad and the battle of Kursk, the biggest tank battle in all history.